I'm not entirely sure how to word this, but what is the largest set of one syllable words you can find in which every phonetic sound is the same except the vowel? For example, 'arc', 'orc', and 'irk' are a 3 word set in which each word is pronounced _rk with the _ replaced by ä, ô, and ə, respectively. Vowel combinations and diphthongs are allowed, but not adding more vowels in a different place is not. For example, 'orca' does not fit into the above set and neither does 'park'.
I came up with a set containing at least four or five words, but I'm hoping you all can find more
Words are considered valid if they are contained in the OED. Acronyms do not count.
I realize that I wasn't quite clear earlier about what constitutes a valid answer. What we're really looking for here is a set of words whose phonetic spellings are the same except for their phonetic vowel or vowels. So in my earlier example of cute, cut, kite, etc. 'cute' should probably be disqualified because it is pronounced 'kjut' where j is considered a phonetic consonant according to the OED list of phonetic letters.
Also, words like 'bird' are acceptable in the same list as 'bed' if you specify that they are being pronounced 'bəːd' (the English way) not 'bərd'(the American way) I wasn't going to include those, but I changed my mind, sorry @RosieF, you were right.
Homophones only count as one word, so 'cote' and 'coat' are only one word since they are both pronounced 'kəʊt'.
If you feel like two words are pronounced differently, but I or someone else disagrees with you, see if you can find two separate phonetic spellings to justify your point.